CN102020984B - Diversion fracturing temporary plugging agent in low-permeability oilfield joints and preparation method and application thereof - Google Patents
Diversion fracturing temporary plugging agent in low-permeability oilfield joints and preparation method and application thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 43
- -1 polyoxyethylene diacrylate Polymers 0.000 claims abstract description 15
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000003999 initiator Substances 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 6
- 239000012065 filter cake Substances 0.000 claims description 20
- 230000035699 permeability Effects 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 9
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 6
- 239000013543 active substance Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000001828 Gelatine Substances 0.000 claims description 5
- 229920002472 Starch Polymers 0.000 claims description 5
- 229920000159 gelatin Polymers 0.000 claims description 5
- 235000019322 gelatine Nutrition 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- BQODPTQLXVVEJG-UHFFFAOYSA-N [O].C=C Chemical group [O].C=C BQODPTQLXVVEJG-UHFFFAOYSA-N 0.000 claims description 4
- 229910021538 borax Inorganic materials 0.000 claims description 4
- 239000004328 sodium tetraborate Substances 0.000 claims description 4
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 claims description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical group N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims 1
- 235000011130 ammonium sulphate Nutrition 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 239000005711 Benzoic acid Substances 0.000 abstract 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 abstract 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 abstract 1
- 229920000881 Modified starch Polymers 0.000 abstract 1
- 239000004368 Modified starch Substances 0.000 abstract 1
- 235000010233 benzoic acid Nutrition 0.000 abstract 1
- 239000002639 bone cement Substances 0.000 abstract 1
- 239000003431 cross linking reagent Substances 0.000 abstract 1
- 238000004090 dissolution Methods 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 239000000839 emulsion Substances 0.000 abstract 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 abstract 1
- 235000019426 modified starch Nutrition 0.000 abstract 1
- 239000004094 surface-active agent Substances 0.000 abstract 1
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- 239000004160 Ammonium persulphate Substances 0.000 description 3
- 235000019395 ammonium persulphate Nutrition 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 241000124033 Salix Species 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004970 Chain extender Substances 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
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Abstract
The invention relates to a diverting fracturing temporary plugging agent in a low-permeability oilfield seam, a preparation method and application thereof; mixing bone glue powder, benzoic acid, modified starch, hydroxyethyl cellulose, a surfactant containing F and a cross-linking agent according to the mass ratio of 92 percent to 0.2 percent to 5 percent to 1.3 percent to 1.0 percent to 0.5 percent; adding polyoxyethylene diacrylate with the concentration of 5-100 mg/L and the initiator concentration of 100-500 mg/L, reacting at the temperature of 80 ℃ and the pressure of 1.2Mpa to form gel, and then granulating, oiling and drying to obtain the oil-based emulsion; the maximum expansion ratio is 1.33, the temperature resistance stability is good, the adhesion is stable, the maximum elongation is 64%, the breakthrough pressure gradient reaches 30.0MPa/m, the viscosity value after complete dissolution at 60 ℃ is 35mPa.s, and the fracturing fluid can be completely discharged under the carrying effect.
Description
Technical field:
The present invention relates to turn to pressure break temporary plugging agent and its preparation method and application in a kind of seam that is applied to the transformation of low permeability oil field reservoir refracturing.
Background technology:
Low permeability oil field adopts conventional multiple fracturing technique to excavate the stratum potentiality usually, improves the oil well per-well production, this technology mainly is to add a certain amount of propping agent again to the stratum, in former crack, realize the laid again of propping agent, improve fracture flow capacity, realize the purpose of volume increase.Still there is certain limitation in this technology in volume increase: one, well higher for producing energy, that the effective response for water flood history is arranged is implemented conventional multiple fracturing technique, causes the excessive extension of man-made fracture, finally cause refracturing after well water rise too fast; Its two, for the low yield poor efficiency well that is in waterline direction in the injection-production pattern, the excessive extension for fear of man-made fracture along the waterline direction, the common scale of conventional refracturing is less, pressure break does not form new draining district, fracturing effect is relatively poor; Its three, for the oil well that is in oil reservoir limit portion, owing to there is not perfect injection-production pattern, do not set up rational injection-production relation, producing energy keeps level lower, causes conventional refracturing effect relatively poor.
Summary of the invention:
The objective of the invention is to develop a kind of solid granule temporary plugging agent, add an amount of this viscoelastic solid granule temporary plugging agent to the stratum, fluid flow is followed the principle that flows to the minimum direction of resistance, the temporary plugging agent particle enters the borehole of pit shaft, part enters crack or the most permeable zone in the stratum, produce the filter cake bridge blinding at borehole and high permeability zone, formation is higher than the pressure difference of gash fracture pressure, follow-up work liquid can not be entered to crack and high permeability zone, thereby fracturing liquid enters area of high stress or new fracture layers, impels the generation of new seam and the laid variation of propping agent.Link up and do not employed the draining district, reach the purpose of volume increase.
This viscoelastic solid granule temporary plugging agent outward appearance of the present invention is brownish black or the irregular solid particulate of black, particle diameter 5-8mm, by a certain proportion of gelatine powder, phenylformic acid, treated starch, Natvosol, contain the F tensio-active agent, linking agent, ammonium persulphate, polyoxyethylene diacrylate activates into glue by the potential energy of action of evocating crosslinking reaction and physics method under high-temperature and high-pressure conditions, form the polymer of crosslinked body structure, pass through granulation then, oil, stoving process forms, and has the breakthrough pressure height, can be water-soluble, salt resistant character is good, characteristics such as inierpeneirating network structure preferably.
Preparation process condition is: 80 ℃ of temperature, pressure 1.2Mpa, and gelatine powder, phenylformic acid, treated starch, Natvosol, the quality proportioning that contains F tensio-active agent (perfluoroalkyl acrylate), linking agent (borax) they are 92%: 0.2%: 5%: 1.3%: 1.0%: 0.5%; Oxygen ethylene chain joint number is preferred 5～10 in the polyoxyethylene diacrylate molecule, and concentration is 5～100mg/L; Polyoxyethylene diacrylate is a kind of chainextender, and a small amount of adding can improve the molecular weight of multipolymer, guarantees that formed temporary plugging agent has the good filtration capacity that turns to, falls in injection process; And the polymer that is formed by the polyoxyethylene diacrylate chain extension, its ester bond can decompose, and temperature is more high, decomposes more soon, and these characteristics make that temporary plugging agent can be water-soluble, are conducive to the row of returning.Initiator initiator system of ammonium persulfate, formaldehyde or sodium hydrosulfite, concentration are 100～500mg/L.
To determining of stratum add-on
The consumption of fracture propagation control agent is relevant with the pressure drop of bearing, fluid viscosity, filter cake intensity etc.
Rcake＝Δpcake/μu ake＝Δpcake/μu (1)
Rcake in the formula---resistance of filter cake, m-1;
Δ p---the pressure drop of filter cake both sides; μ---transport fluid viscosity; U---flow through the area flow of filter cake.
Definition one specific resistance of filter cake α, unit is m/kg:
α＝1/ρdiv(1-φcake)Kcake (2)
Can obtain pressure drop by filter cake by this formula:
Δp＝αμucdivρdivV/A (3)
ρ div in the formula---turn to the density of particle, kg/m3; The porosity of φ cake---filter cake;
Kcake---filter cake rate of permeation;
Cdiv---turn to the concentration of particle, m3 particle/m3 solution;
V---inject the cumulative volume that turns to liquid; The surface-area of A---filter cake.
Darcy law by filter cake can get formula (3)
Δp＝μlu/Kcake (4)
The liquid measure of filter cake thickness l and injectant is closed: l=cdivV/ (1-φ cake) A (5)
The α of combined type (2) definition then draws the expression formula (3) by the pressure drop of filter cake.The pass of resistance of filter cake Rcake and specific resistance of filter cake α is:
Rcake＝αcdivρdivV/A (6)
Rcake＝Δpcake/μu (1)
Rcake in the formula---resistance of filter cake, m-1;
Δ p---the pressure drop of filter cake both sides;
μ---transport fluid viscosity;
U---flow through the area flow of filter cake.
The equation of the growth of filter cake:
dρaj/dt＝2πKjhjΔP/μ[ln(re/rw)+Sj+2πKjhjRcakej/A]×c’div/Aj。
2006-2008 in Jingan County, oil fields such as Wuqi County, the You Fang village have implemented 32 mouthfuls of well test in places, the average individual well of the oil well oily 1.86t that increases day by day, accumulative total increases oil and has reached 6928.43t, has obtained test in place effect preferably.
Turn to pressure break temporary plugging agent performance in the low permeability oil field seam:
1) temporary plugging agent swelling property and solvability evaluation: the volume of temporary plugging agent is along with the increase of time becomes big earlier, and maximum ratio of expansion is 1.33, reaches high adsorptive power.After dissolving in 8 hours, temporary plugging agent can dissolve fully.
2) temporary plugging agent temperature resistance estimation of stability: according to the laboratory experiment result, temperature is less to the expansion multiple proportions influence of temporary plugging agent sample, the temperature resistance good stability.
3) the adhesivity evaluation of temporary plugging agent and wall: according to experimental result, temporary plugging agent can rise sticking in 20-30min, and adhesivity is stable.
4) temporary plugging agent anamorphic stretching merit rating: temporary plugging agent maximum elongation rate is 64%, pressure-bearing elongation better performances, and toughness is better.
5) the temporary plugging agent plugging strength is estimated: determine that through overtesting the breakthrough pressure gradient of temporary plugging agent reaches 30.0MPa/m.
6) temporary plugging agent returns row's performance evaluation: the temporary plugging agent sample under 60 ℃ of conditions fully the viscosity number after the dissolving be 35mPa.s, under of the fracturing fluid rolling action, can return fully and eject.
Description of drawings
The long celebrating of Fig. 1 oil field willow 91-26 well construction graphic representation.
The long celebrating of Fig. 2 oil field willow 91-26 well construction graphic representation.
The real-time monitoring curve figure of Fig. 3 bottomhole wellbore pressure.
Fig. 4 production pattern.
Embodiment
Embodiment 1
The preparation temporary plugging agent:
Preparation process condition is: 80 ℃ of temperature, pressure 1.2Mpa,
Raw material: gelatine powder, phenylformic acid, treated starch, Natvosol, contain F tensio-active agent (perfluoroalkyl acrylate), linking agent (borax), polyoxyethylene diacrylate (oxygen ethylene chain joint number preferred 5～10 in the polyoxyethylene diacrylate molecule), initiator (ammonium persulphate).
Preparation process: with gelatine powder, phenylformic acid, treated starch, Natvosol, contain F tensio-active agent (perfluoroalkyl acrylate), linking agent (borax) is 92%: 0.2%: 5% by the quality proportioning: mixing in 1.3%: 1.0%: 0.5%; Add an amount of polyoxyethylene diacrylate (oxygen ethylene chain joint number preferred 5～10 in the polyoxyethylene diacrylate molecule, concentration is 5～100m g/L) and initiator (ammonium persulphate, concentration is 100～500mg/L), under 80 ℃ of temperature, pressure 1.2Mpa condition, be reacted into glue, pass through granulation then, oil, dry.
Long celebrating oil field Liu91-26Jing
1. zone of interest master data
The measure foundation
This well on August 30th, 2002 goes into operation, in December, 2004 effective response for water flood, output 5.45m
3Liquid measure is low to moderate 1.97m at present
3, this well reservoir physical property is good, and offset well 90-27,91-27 output are all at 6m
3More than; The present liquid measure of this well descends, and temporarily stifled pressure break is implemented in suggestion, improves single well productivity, and liquid is adopted on balanced plane.
3. infusion program
4. construction curve
5. bottomhole wellbore pressure is monitored in real time
It is mild that mini-frac, main pressure break pressure surge all occurs in earlier stage, " net pressure " curve adds the sand section, illustrates that reservoir natural fracture potentialities of development is bigger.
The parting pressure of mini-frac is 22.347MPa, and the parting pressure of main pressure break is 43.446MPa, and temporary plugging agent shutoff crack effect is obvious.
6. yield curve
Claims (4)
1. turn to the preparation method of pressure break agent in the low permeability oil field seam, it is characterized in that: with gelatine powder, phenylformic acid, treated starch, Natvosol, to contain F tensio-active agent, linking agent be that 92%:0.2%:5%:1.3%:1.0%:0.5% mixes by the quality proportioning; Add polyoxyethylene diacrylate, concentration is that 5～100mg/L and initiator concentration are 100～500mg/L, is reacted into glue under 80 ℃ of temperature, pressure 1.2Mpa condition, then through granulation, oil, dry and form;
Oxygen ethylene chain joint number is 5～10 in the described polyoxyethylene diacrylate molecule.
2. turn to the preparation method of pressure break agent in a kind of low permeability oil field seam according to claim 1, it is characterized in that: containing the F tensio-active agent is perfluoroalkyl acrylate; Linking agent is borax; Initiator is ammonium sulfate, formaldehyde or sodium hydrosulfite.
3. turn to the pressure break agent in a low permeability oil field seam, it is characterized in that: it is to turn to the preparation method of pressure break agent to be prepared from the low permeability oil field seam according to claim 1.
4. turn to the application of pressure break agent in the described low permeability oil field of claim 3 stitches, it is characterized in that: turn to the pressure break agent to the stratum adding, fluid flow is followed the principle that flows to the minimum direction of resistance, turn to pressure break agent particle to enter the borehole of pit shaft, part enters crack or the most permeable zone in the stratum, produce the filter cake bridge blinding at borehole and high permeability zone, formation is higher than the pressure difference of gash fracture pressure, follow-up work liquid can not be entered to crack and high permeability zone, thereby fracturing liquid enters area of high stress or new fracture layers, impels the generation of new seam and the laid variation of propping agent.
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| CN106047323A (en) * | 2016-05-26 | 2016-10-26 | 中国石油集团渤海钻探工程有限公司 | Water-soluble temporary plugging agent and preparation method thereof |
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